Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Does any body know the difference of these two commands in 3550?

Hi all,

Does any body know what's the difference between these two interface commands in 3550:

1. mls qos trust cos

2. switchport priority extend trust

Thank You!

Best Regards

Teru Lei

2 ACCEPTED SOLUTIONS

Accepted Solutions
Silver

Re: Does any body know the difference of these two commands in 3

Teru,

mls qos trust cos - Classify ingress traffic packets with packet CoS values (don't overwrite). For untagged packets, use

the port default CoS value.

switchport priority extend trust - Set the IP phone port to

trust the priority received from the PC or the attached device instead of writting it to 0.

Hope this is what you were looking for,

Don

Cisco Employee

Re: Does any body know the difference of these two commands in 3

switchport priority extend trust is used to trust or set the IP phone port to override the priority received from PC or the attached device.

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550cr/cli2.htm#2490663

mls qos trust cos is used to trust cos of the device direclty connected to the switchport

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550cr/cli1.htm#1863313

2 REPLIES
Silver

Re: Does any body know the difference of these two commands in 3

Teru,

mls qos trust cos - Classify ingress traffic packets with packet CoS values (don't overwrite). For untagged packets, use

the port default CoS value.

switchport priority extend trust - Set the IP phone port to

trust the priority received from the PC or the attached device instead of writting it to 0.

Hope this is what you were looking for,

Don

Cisco Employee

Re: Does any body know the difference of these two commands in 3

switchport priority extend trust is used to trust or set the IP phone port to override the priority received from PC or the attached device.

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550cr/cli2.htm#2490663

mls qos trust cos is used to trust cos of the device direclty connected to the switchport

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550cr/cli1.htm#1863313

93
Views
0
Helpful
2
Replies